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Question about "Trigger Context Variables"
Is it possible for more than one of these variables to be true within a single invocation of a trigger?
Trigger.isInsert
Trigger.isUpdate
Trigger.isDelete
Trigger.isUndelete
No, a given operation will invoke the trigger so therefore it will only be insert OR update OR Delete OR Undelete.
Those context variables enable you to identify the different operations within the same trigger.